387881 has 4 divisors (see below), whose sum is σ = 417732. Its totient is φ = 358032.

The previous prime is 387857. The next prime is 387911. The reversal of 387881 is 188783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 354025 = 184^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 387881 - 2¹⁸ = 125737 is a prime.

It is a super-2 number, since 2×387881² = 300903340322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14906 + ... + 14931.

It is an arithmetic number, because the mean of its divisors is an integer number (104433).

2³⁸⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

387881 is a deficient number, since it is larger than the sum of its proper divisors (29851).

387881 is a wasteful number, since it uses less digits than its factorization.

387881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29850.

The product of its digits is 10752, while the sum is 35.

The square root of 387881 is about 622.8009312774. The cubic root of 387881 is about 72.9288729860.

The spelling of 387881 in words is "three hundred eighty-seven thousand, eight hundred eighty-one".